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Finding the Fourth Proportional to 21,615.88, 29,827.38 and 12,183.88

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Solution

The fourth proportional to 21,615.88, 29,827.38 and 12,183.88 is: 16,812.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,615.88 : 29,827.38 = 12,183.88 : x
  2. Step 2: Convert to fraction form
    21,615.88/29,827.38 = 12,183.88/x
  3. Step 3: Cross multiply
    21,615.88x = 29,827.38 × 12,183.88
  4. Step 4: Simplify right side
    21,615.88x = 363,413,218.63
  5. Step 5: Solve for x
    x = 363,413,218.63/21,615.88
  6. Step 6: Final answer
    x = 16,812.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.